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Abstract

This article describes the new scheme to rescue hard errors of Hard Disk Drive (HDD) caused by defects on sync field and VFO unlock. Appling several steps to change length of sync field to Data Recovery Procedure, we could perfectly rescue hard errors by defects on sync field.

Country

United States

Language

English (United States)

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This is the abbreviated version, containing approximately
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Data Recovery with Adaptive Sync Field Length

This article
describes the new scheme to rescue hard errors of
Hard Disk Drive (HDD) caused by defects on sync field and VFO unlock.
Appling several steps to change length of sync field to Data Recovery
Procedure, we could perfectly rescue hard errors by defects on sync
field.

On each
sector of HDD, there are several field of Sync, Address
Mark, Data, ECC, PAD (Fig. 1).

In the middle
of the SYNC field, PLL mode changes from High
gain mode to normal gain mode for VFO to be locked. But when there
are defects around this mode-change timing, these defects become the
cause of bit-shift so that PLL cannot be locked and error will occur.
This error cannot correct by ECC because ECC affects data area only.

This
invention can solve this problem by changing rise timing
of Read Gate by 5nsec forward and backward and changing PLL mode
change
timing as the same. We inserted this
sequence into the Data Recovery
Procedure and 100% rescued hard errors.